Page 695 - 5G Basics - Core Network Aspects

Transport aspects 2

Figure 5-9 – FTU protocol reference model

The functionality of the TPS-TC, PMS-TC and PMD sub-layers is defined, respectively, in clauses 8, 9 and 10
of this Recommendation.
The reference points presented in Figure 5-9 are defined by sets of corresponding data or management
primitives. A brief summary of these reference points is presented in Table 5-5. Detailed descriptions can
be found in the clauses referenced in this table.
Table 5-5 – Summary of the FTU reference points defined in the Recommendation

Reference Category Brief description of information flow Reference
point
γ Data, bidirectional, Units of user data of the applied transmission Clause 8.1.1
logical protocols, data flow-control signalling, data
start/stop markers, etc.
α Data, bidirectional, Primitives of the data stream incoming to the PMS- Clause 8.1.2
logical TC from the TPS-TC and of the data stream
forwarded by the PMS-TC to the TPS-TC
δ Data, bidirectional, Primitives of the data stream incoming to the PMD Clause 9.1.1
logical from the PMS-TC and of the data stream forwarded
by the PMD to the PMS-TC
U Data, bidirectional, Primitives of the physical signal on the line Clause 10.1.1
physical
γ_MC Management/control, Management and control primitives exchanged Clauses 8.1.1,
bidirectional, between the FME and the upper-layer functions 10.3 and 11.1.1
logical/functional DRA, TCE, ME and VCE.

685